NEET-XII-Physics
38: Electromagnetic Induction
- #2A conducting rod is moved with a constant velocity v in a magnetic field. A potential difference appears across the two ends
(a) if
v →∥l →
(b) if
v →∥B →
(c) if
l →∥B →
(d) none of these.digAnsr: d,i,ii,iiiAns : (d) none of these
The potential difference across the two ends is given by
`` e=Bvl``
It is non-zero only
(i) if the rod is moving in the direction perpendicular to the magnetic field (`` \stackrel{\to }{v}\perp \stackrel{\to }{B}``)
(ii) if the velocity of the rod is in the direction perpendicular to the length of the rod
( `` \stackrel{\to }{v}\perp \stackrel{\to }{l}``)
(iii) if the magnetic field is perpendicular to the length of the rod `` \stackrel{\to }{l}\perp \stackrel{\to }{B}``
Thus, none of the above conditions is satisfied in the alternatives given.
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